The Tcpdump Group git mirrors - tcpdump/blob - print.c

   1 /*
   2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 2000
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that: (1) source code distributions
   7  * retain the above copyright notice and this paragraph in its entirety, (2)
   8  * distributions including binary code include the above copyright notice and
   9  * this paragraph in its entirety in the documentation or other materials
  10  * provided with the distribution, and (3) all advertising materials mentioning
  11  * features or use of this software display the following acknowledgement:
  12  * ``This product includes software developed by the University of California,
  13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  14  * the University nor the names of its contributors may be used to endorse
  15  * or promote products derived from this software without specific prior
  16  * written permission.
  17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  20  *
  21  * Support for splitting captures into multiple files with a maximum
  22  * file size:
  23  *
  24  * Copyright (c) 2001
  25  *      Seth Webster <swebster@sst.ll.mit.edu>
  26  */
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include <config.h>
  30 #endif
  31
  32 #include <stdlib.h>
  33 #include <string.h>
  34
  35 #include "netdissect-stdinc.h"
  36
  37 #include "netdissect.h"
  38 #include "addrtoname.h"
  39 #include "print.h"
  40
  41 struct printer {
  42         if_printer f;
  43         int type;
  44 };
  45
  46 static const struct printer printers[] = {
  47         { ether_if_print,       DLT_EN10MB },
  48 #ifdef DLT_IPNET
  49         { ipnet_if_print,       DLT_IPNET },
  50 #endif
  51 #ifdef DLT_IEEE802_15_4
  52         { ieee802_15_4_if_print, DLT_IEEE802_15_4 },
  53 #endif
  54 #ifdef DLT_IEEE802_15_4_NOFCS
  55         { ieee802_15_4_if_print, DLT_IEEE802_15_4_NOFCS },
  56 #endif
  57 #ifdef DLT_PPI
  58         { ppi_if_print,         DLT_PPI },
  59 #endif
  60 #ifdef DLT_NETANALYZER
  61         { netanalyzer_if_print, DLT_NETANALYZER },
  62 #endif
  63 #ifdef DLT_NETANALYZER_TRANSPARENT
  64         { netanalyzer_transparent_if_print, DLT_NETANALYZER_TRANSPARENT },
  65 #endif
  66 #if defined(DLT_NFLOG) && defined(HAVE_PCAP_NFLOG_H)
  67         { nflog_if_print,       DLT_NFLOG},
  68 #endif
  69 #ifdef DLT_CIP
  70         { cip_if_print,         DLT_CIP },
  71 #endif
  72 #ifdef DLT_ATM_CLIP
  73         { cip_if_print,         DLT_ATM_CLIP },
  74 #endif
  75 #ifdef DLT_IP_OVER_FC
  76         { ipfc_if_print,        DLT_IP_OVER_FC },
  77 #endif
  78         { null_if_print,        DLT_NULL },
  79 #ifdef DLT_LOOP
  80         { null_if_print,        DLT_LOOP },
  81 #endif
  82 #ifdef DLT_APPLE_IP_OVER_IEEE1394
  83         { ap1394_if_print,      DLT_APPLE_IP_OVER_IEEE1394 },
  84 #endif
  85 #if defined(DLT_BLUETOOTH_HCI_H4_WITH_PHDR) && defined(HAVE_PCAP_BLUETOOTH_H)
  86         { bt_if_print,          DLT_BLUETOOTH_HCI_H4_WITH_PHDR},
  87 #endif
  88 #ifdef DLT_LANE8023
  89         { lane_if_print,        DLT_LANE8023 },
  90 #endif
  91         { arcnet_if_print,      DLT_ARCNET },
  92 #ifdef DLT_ARCNET_LINUX
  93         { arcnet_linux_if_print, DLT_ARCNET_LINUX },
  94 #endif
  95         { raw_if_print,         DLT_RAW },
  96 #ifdef DLT_IPV4
  97         { raw_if_print,         DLT_IPV4 },
  98 #endif
  99 #ifdef DLT_IPV6
 100         { raw_if_print,         DLT_IPV6 },
 101 #endif
 102 #ifdef DLT_USB_LINUX
 103         { usb_linux_48_byte_if_print, DLT_USB_LINUX},
 104 #endif /* DLT_USB_LINUX */
 105 #ifdef DLT_USB_LINUX_MMAPPED
 106         { usb_linux_64_byte_if_print, DLT_USB_LINUX_MMAPPED},
 107 #endif /* DLT_USB_LINUX_MMAPPED */
 108 #ifdef DLT_SYMANTEC_FIREWALL
 109         { symantec_if_print,    DLT_SYMANTEC_FIREWALL },
 110 #endif
 111 #ifdef DLT_C_HDLC
 112         { chdlc_if_print,       DLT_C_HDLC },
 113 #endif
 114 #ifdef DLT_HDLC
 115         { chdlc_if_print,       DLT_HDLC },
 116 #endif
 117 #ifdef DLT_PPP_ETHER
 118         { pppoe_if_print,       DLT_PPP_ETHER },
 119 #endif
 120 #if defined(DLT_PFLOG) && defined(HAVE_NET_IF_PFLOG_H)
 121         { pflog_if_print,       DLT_PFLOG },
 122 #endif
 123         { token_if_print,       DLT_IEEE802 },
 124         { fddi_if_print,        DLT_FDDI },
 125 #ifdef DLT_LINUX_SLL
 126         { sll_if_print,         DLT_LINUX_SLL },
 127 #endif
 128 #ifdef DLT_FR
 129         { fr_if_print,          DLT_FR },
 130 #endif
 131 #ifdef DLT_FRELAY
 132         { fr_if_print,          DLT_FRELAY },
 133 #endif
 134 #ifdef DLT_MFR
 135         { mfr_if_print,         DLT_MFR },
 136 #endif
 137         { atm_if_print,         DLT_ATM_RFC1483 },
 138 #ifdef DLT_SUNATM
 139         { sunatm_if_print,      DLT_SUNATM },
 140 #endif
 141 #ifdef DLT_ENC
 142         { enc_if_print,         DLT_ENC },
 143 #endif
 144         { sl_if_print,          DLT_SLIP },
 145 #ifdef DLT_SLIP_BSDOS
 146         { sl_bsdos_if_print,    DLT_SLIP_BSDOS },
 147 #endif
 148 #ifdef DLT_LTALK
 149         { ltalk_if_print,       DLT_LTALK },
 150 #endif
 151 #ifdef DLT_JUNIPER_ATM1
 152         { juniper_atm1_if_print, DLT_JUNIPER_ATM1 },
 153 #endif
 154 #ifdef DLT_JUNIPER_ATM2
 155         { juniper_atm2_if_print, DLT_JUNIPER_ATM2 },
 156 #endif
 157 #ifdef DLT_JUNIPER_MFR
 158         { juniper_mfr_if_print, DLT_JUNIPER_MFR },
 159 #endif
 160 #ifdef DLT_JUNIPER_MLFR
 161         { juniper_mlfr_if_print, DLT_JUNIPER_MLFR },
 162 #endif
 163 #ifdef DLT_JUNIPER_MLPPP
 164         { juniper_mlppp_if_print, DLT_JUNIPER_MLPPP },
 165 #endif
 166 #ifdef DLT_JUNIPER_PPPOE
 167         { juniper_pppoe_if_print, DLT_JUNIPER_PPPOE },
 168 #endif
 169 #ifdef DLT_JUNIPER_PPPOE_ATM
 170         { juniper_pppoe_atm_if_print, DLT_JUNIPER_PPPOE_ATM },
 171 #endif
 172 #ifdef DLT_JUNIPER_GGSN
 173         { juniper_ggsn_if_print, DLT_JUNIPER_GGSN },
 174 #endif
 175 #ifdef DLT_JUNIPER_ES
 176         { juniper_es_if_print,  DLT_JUNIPER_ES },
 177 #endif
 178 #ifdef DLT_JUNIPER_MONITOR
 179         { juniper_monitor_if_print, DLT_JUNIPER_MONITOR },
 180 #endif
 181 #ifdef DLT_JUNIPER_SERVICES
 182         { juniper_services_if_print, DLT_JUNIPER_SERVICES },
 183 #endif
 184 #ifdef DLT_JUNIPER_ETHER
 185         { juniper_ether_if_print,       DLT_JUNIPER_ETHER },
 186 #endif
 187 #ifdef DLT_JUNIPER_PPP
 188         { juniper_ppp_if_print, DLT_JUNIPER_PPP },
 189 #endif
 190 #ifdef DLT_JUNIPER_FRELAY
 191         { juniper_frelay_if_print,      DLT_JUNIPER_FRELAY },
 192 #endif
 193 #ifdef DLT_JUNIPER_CHDLC
 194         { juniper_chdlc_if_print,       DLT_JUNIPER_CHDLC },
 195 #endif
 196 #ifdef DLT_PKTAP
 197         { pktap_if_print,       DLT_PKTAP },
 198 #endif
 199 #ifdef DLT_IEEE802_11_RADIO
 200         { ieee802_11_radio_if_print,    DLT_IEEE802_11_RADIO },
 201 #endif
 202 #ifdef DLT_IEEE802_11
 203         { ieee802_11_if_print,  DLT_IEEE802_11},
 204 #endif
 205 #ifdef DLT_IEEE802_11_RADIO_AVS
 206         { ieee802_11_radio_avs_if_print,        DLT_IEEE802_11_RADIO_AVS },
 207 #endif
 208 #ifdef DLT_PRISM_HEADER
 209         { prism_if_print,       DLT_PRISM_HEADER },
 210 #endif
 211         { ppp_if_print,         DLT_PPP },
 212 #ifdef DLT_PPP_WITHDIRECTION
 213         { ppp_if_print,         DLT_PPP_WITHDIRECTION },
 214 #endif
 215 #ifdef DLT_PPP_BSDOS
 216         { ppp_bsdos_if_print,   DLT_PPP_BSDOS },
 217 #endif
 218 #ifdef DLT_PPP_SERIAL
 219         { ppp_hdlc_if_print,    DLT_PPP_SERIAL },
 220 #endif
 221         { NULL,                 0 },
 222 };
 223
 224 static void     ndo_default_print(netdissect_options *ndo, const u_char *bp,
 225                     u_int length);
 226
 227 static void NORETURN ndo_error(netdissect_options *ndo,
 228                      status_exit_codes_t status,
 229                      FORMAT_STRING(const char *fmt), ...)
 230                      PRINTFLIKE(3, 4);
 231 static void     ndo_warning(netdissect_options *ndo,
 232                     FORMAT_STRING(const char *fmt), ...)
 233                     PRINTFLIKE(2, 3);
 234
 235 static int      ndo_printf(netdissect_options *ndo,
 236                      FORMAT_STRING(const char *fmt), ...)
 237                      PRINTFLIKE(2, 3);
 238
 239 void
 240 init_print(netdissect_options *ndo, uint32_t localnet, uint32_t mask,
 241            uint32_t timezone_offset)
 242 {
 243
 244         thiszone = timezone_offset;
 245         init_addrtoname(ndo, localnet, mask);
 246         init_checksum();
 247 }
 248
 249 if_printer
 250 lookup_printer(int type)
 251 {
 252         const struct printer *p;
 253
 254         for (p = printers; p->f; ++p)
 255                 if (type == p->type)
 256                         return p->f;
 257
 258 #if defined(DLT_USER2) && defined(DLT_PKTAP)
 259         /*
 260          * Apple incorrectly chose to use DLT_USER2 for their PKTAP
 261          * header.
 262          *
 263          * We map DLT_PKTAP, whether it's DLT_USER2 as it is on Darwin-
 264          * based OSes or the same value as LINKTYPE_PKTAP as it is on
 265          * other OSes, to LINKTYPE_PKTAP, so files written with
 266          * this version of libpcap for a DLT_PKTAP capture have a link-
 267          * layer header type of LINKTYPE_PKTAP.
 268          *
 269          * However, files written on OS X Mavericks for a DLT_PKTAP
 270          * capture have a link-layer header type of LINKTYPE_USER2.
 271          * If we don't have a printer for DLT_USER2, and type is
 272          * DLT_USER2, we look up the printer for DLT_PKTAP and use
 273          * that.
 274          */
 275         if (type == DLT_USER2) {
 276                 for (p = printers; p->f; ++p)
 277                         if (DLT_PKTAP == p->type)
 278                                 return p->f;
 279         }
 280 #endif
 281
 282         return NULL;
 283         /* NOTREACHED */
 284 }
 285
 286 int
 287 has_printer(int type)
 288 {
 289         return (lookup_printer(type) != NULL);
 290 }
 291
 292 if_printer
 293 get_if_printer(netdissect_options *ndo, int type)
 294 {
 295         const char *dltname;
 296         if_printer printer;
 297
 298         printer = lookup_printer(type);
 299         if (printer == NULL) {
 300                 dltname = pcap_datalink_val_to_name(type);
 301                 if (dltname != NULL)
 302                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 303                                           "packet printing is not supported for link type %s: use -w",
 304                                           dltname);
 305                 else
 306                         (*ndo->ndo_error)(ndo, S_ERR_ND_NO_PRINTER,
 307                                           "packet printing is not supported for link type %d: use -w", type);
 308         }
 309         return printer;
 310 }
 311
 312 void
 313 pretty_print_packet(netdissect_options *ndo, const struct pcap_pkthdr *h,
 314                     const u_char *sp, u_int packets_captured)
 315 {
 316         u_int hdrlen;
 317         int invalid_header = 0;
 318
 319         if(ndo->ndo_packet_number)
 320                 ND_PRINT("%5u  ", packets_captured);
 321
 322         /* Sanity checks on packet length / capture length */
 323         if(h->caplen == 0) {
 324                 invalid_header = 1;
 325                 ND_PRINT("[Invalid header: caplen==0");
 326         }
 327         if (h->len == 0) {
 328                 if (!invalid_header) {
 329                         invalid_header = 1;
 330                         ND_PRINT("[Invalid header:");
 331                 } else
 332                         ND_PRINT(",");
 333                 ND_PRINT(" len==0");
 334         } else if (h->len < h->caplen) {
 335                 if (!invalid_header) {
 336                         invalid_header = 1;
 337                         ND_PRINT("[Invalid header:");
 338                 } else
 339                         ND_PRINT(",");
 340                 ND_PRINT(" len(%u) < caplen(%u)", h->len, h->caplen);
 341         }
 342         if (h->caplen > MAXIMUM_SNAPLEN) {
 343                 if (!invalid_header) {
 344                         invalid_header = 1;
 345                         ND_PRINT("[Invalid header:");
 346                 } else
 347                         ND_PRINT(",");
 348                 ND_PRINT(" caplen(%u) > %u", h->caplen, MAXIMUM_SNAPLEN);
 349         }
 350         if (h->len > MAXIMUM_SNAPLEN) {
 351                 if (!invalid_header) {
 352                         invalid_header = 1;
 353                         ND_PRINT("[Invalid header:");
 354                 } else
 355                         ND_PRINT(",");
 356                 ND_PRINT(" len(%u) > %u", h->len, MAXIMUM_SNAPLEN);
 357         }
 358         if (invalid_header) {
 359                 ND_PRINT("]\n");
 360                 return;
 361         }
 362
 363         /*
 364          * At this point:
 365          *   capture length != 0,
 366          *   packet length != 0,
 367          *   capture length <= MAXIMUM_SNAPLEN,
 368          *   packet length <= MAXIMUM_SNAPLEN,
 369          *   packet length >= capture length.
 370          *
 371          * Currently, there is no D-Bus printer, thus no need for
 372          * bigger lengths.
 373          */
 374
 375         ts_print(ndo, &h->ts);
 376
 377         /*
 378          * Printers must check that they're not walking off the end of
 379          * the packet.
 380          * Rather than pass it all the way down, we set this member
 381          * of the netdissect_options structure.
 382          */
 383         ndo->ndo_snapend = sp + h->caplen;
 384
 385         hdrlen = (ndo->ndo_if_printer)(ndo, h, sp);
 386
 387         /*
 388          * Restore the original snapend, as a printer might have
 389          * changed it.
 390          */
 391         ndo->ndo_snapend = sp + h->caplen;
 392         if (ndo->ndo_Xflag) {
 393                 /*
 394                  * Print the raw packet data in hex and ASCII.
 395                  */
 396                 if (ndo->ndo_Xflag > 1) {
 397                         /*
 398                          * Include the link-layer header.
 399                          */
 400                         hex_and_ascii_print(ndo, "\n\t", sp, h->caplen);
 401                 } else {
 402                         /*
 403                          * Don't include the link-layer header - and if
 404                          * we have nothing past the link-layer header,
 405                          * print nothing.
 406                          */
 407                         if (h->caplen > hdrlen)
 408                                 hex_and_ascii_print(ndo, "\n\t", sp + hdrlen,
 409                                                     h->caplen - hdrlen);
 410                 }
 411         } else if (ndo->ndo_xflag) {
 412                 /*
 413                  * Print the raw packet data in hex.
 414                  */
 415                 if (ndo->ndo_xflag > 1) {
 416                         /*
 417                          * Include the link-layer header.
 418                          */
 419                         hex_print(ndo, "\n\t", sp, h->caplen);
 420                 } else {
 421                         /*
 422                          * Don't include the link-layer header - and if
 423                          * we have nothing past the link-layer header,
 424                          * print nothing.
 425                          */
 426                         if (h->caplen > hdrlen)
 427                                 hex_print(ndo, "\n\t", sp + hdrlen,
 428                                           h->caplen - hdrlen);
 429                 }
 430         } else if (ndo->ndo_Aflag) {
 431                 /*
 432                  * Print the raw packet data in ASCII.
 433                  */
 434                 if (ndo->ndo_Aflag > 1) {
 435                         /*
 436                          * Include the link-layer header.
 437                          */
 438                         ascii_print(ndo, sp, h->caplen);
 439                 } else {
 440                         /*
 441                          * Don't include the link-layer header - and if
 442                          * we have nothing past the link-layer header,
 443                          * print nothing.
 444                          */
 445                         if (h->caplen > hdrlen)
 446                                 ascii_print(ndo, sp + hdrlen, h->caplen - hdrlen);
 447                 }
 448         }
 449
 450         ND_PRINT("\n");
 451 }
 452
 453 /*
 454  * By default, print the specified data out in hex and ASCII.
 455  */
 456 static void
 457 ndo_default_print(netdissect_options *ndo, const u_char *bp, u_int length)
 458 {
 459         hex_and_ascii_print(ndo, "\n\t", bp, length); /* pass on lf and indentation string */
 460 }
 461
 462 /* VARARGS */
 463 static void
 464 ndo_error(netdissect_options *ndo, status_exit_codes_t status,
 465           const char *fmt, ...)
 466 {
 467         va_list ap;
 468
 469         if(ndo->program_name)
 470                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 471         va_start(ap, fmt);
 472         (void)vfprintf(stderr, fmt, ap);
 473         va_end(ap);
 474         if (*fmt) {
 475                 fmt += strlen(fmt);
 476                 if (fmt[-1] != '\n')
 477                         (void)fputc('\n', stderr);
 478         }
 479         nd_cleanup();
 480         exit(status);
 481         /* NOTREACHED */
 482 }
 483
 484 /* VARARGS */
 485 static void
 486 ndo_warning(netdissect_options *ndo, const char *fmt, ...)
 487 {
 488         va_list ap;
 489
 490         if(ndo->program_name)
 491                 (void)fprintf(stderr, "%s: ", ndo->program_name);
 492         (void)fprintf(stderr, "WARNING: ");
 493         va_start(ap, fmt);
 494         (void)vfprintf(stderr, fmt, ap);
 495         va_end(ap);
 496         if (*fmt) {
 497                 fmt += strlen(fmt);
 498                 if (fmt[-1] != '\n')
 499                         (void)fputc('\n', stderr);
 500         }
 501 }
 502
 503 static int
 504 ndo_printf(netdissect_options *ndo, const char *fmt, ...)
 505 {
 506         va_list args;
 507         int ret;
 508
 509         va_start(args, fmt);
 510         ret = vfprintf(stdout, fmt, args);
 511         va_end(args);
 512
 513         if (ret < 0)
 514                 ndo_error(ndo, S_ERR_ND_WRITE_FILE,
 515                           "Unable to write output: %s", pcap_strerror(errno));
 516         return (ret);
 517 }
 518
 519 void
 520 ndo_set_function_pointers(netdissect_options *ndo)
 521 {
 522         ndo->ndo_default_print=ndo_default_print;
 523         ndo->ndo_printf=ndo_printf;
 524         ndo->ndo_error=ndo_error;
 525         ndo->ndo_warning=ndo_warning;
 526 }
 527 /*
 528  * Local Variables:
 529  * c-style: whitesmith
 530  * c-basic-offset: 8
 531  * End:
 532  */